Outboard motor



Aug. 16, 1927. 1,639,339

G. w. GRASS OUTBOARD MOTOR Filed March 4. 1926 2 Sheets-Sheet 1 /5 '//I )5 Z7 ./5 @V E? 8 7 e A o 6 7 /7 l! 65 Fvg 1 Z0' o Z0 S L- L 3 Aug 16 1927' G. w. GRASS OUTBOARD MOTOR Filed March 4. 1926 2 Sheets-Shet 2 Patented Aug.'16, 1927. I y UNITED STATES PATENT OFFICE.

Application med March 4, 192e. serial m. 92,265.

This invention relates to outboard motors. tering air may pass. This shell is closed at In outboard motorswsuch as those adapted its inner end bymeansof the annular memfor detachable association with a small boat, ber 10 as shown in Figure 1, adjacent the 4it has been the usual practice to provide for inner end of the shell. A pair of conduits 60 5 water Jcooling. This waterl cooling,` howor pipes 11 extend outwardly from op osite ever, entails certain complications of strucsides of the cylinder as mostv clearly s own ture, and due to the fact that the boat is rin Figure 2. These pipes provide the outlet used in all kinds of water, it has been found `passages for the air. They open through 1 lthat the water cooling systems. frequently the bottom of a casing 12 Whose edges are 65 clog and give trouble. upturned into proximity to the outer pe- This invention is designed to provide an riphery of the composite Hy wheel as shown, outboard motor which is air cooled, and in Figure 1. I which is so constructed that the same amount The Hy wheel is providedwith vanes arof cooling air is supplied all' portions of ranged in a slantingmanner so as to entrain 70 the cylinder, irrespective of the point at or scoop `up the qair from the ,interior of which the air is admitted or withdrawn the casing 12 and to project it outwardly from the cooling shell. I as the Hy wheel rotates. A convenient F urther objects are to provide a novel way of forming this Hy wheel'is to bolt a form of air cooled motor in which Hnsare lower annular member 13 and an upper an- 75 employed both radially and circumferentialnular member 14 to opposite sides of the Hy ly ofI the cylinder. wheel as shown in Figure 1.` These mem- Further objects are to provide a novel bers are provided with vanes 15 carried form of Hy wheel -associated with the air jointly by the two portions as shown in Figcooled motor so that the Hy, wheel itself acts ures 1 and 2. n 80 as the air propelling means. s From Figure 2, it will be seenthat as An embodiment of the invention is shown theHy wheel'rotates in the direction of the in the accompanying drawings, 'in which: arrpw, air will be drawn outwardly from Figure 1 is, an elevation partly in section the casing 12 and will be sucked through the of the motor. i passage provided by the pipes 11. This air 30 Figure 2 is an enlarged sectional view apis drawn from opposite sides of each cylinproximately onl the vline 2 2 of ,Figure 1 der at diametrically opposite points. with the Hy wheel developedvin the section. In order .to insure a uniform How of air Figure 3 is an enlarged sectional view on for all pontions of the`cylinder, lit is to be the line 3 3 of Figure 1. f .ai noted from Figure 2, that the annular fin 7 ,90 $5 Referring to the drawings, it will be seen cooperates with the radial Hns 6 to form that the motor is of the opposed piston type. apertures'l which are smallest immediately Y It is provided with a pair of opposed cylin\ adjacent the pipe 11 and largest at the most ders 1 Within which-the pistons 2 operate. remote points. In other words, the fins or These pistons are connected by suitable pis# flanges 7 are thicker, or of greater depth 95 l0 lton rods with the cranks 3 carried by the adjacent'the pipe 11 than at otherportions engine shaft 4; This engine shaft projects of the cylinder. This construction ofv fins upwardly and carries a Hy wheel 5 whichinsures a uniform How of air for all portions will be deser/ibed in greater detail hereinof the cylinder. f after.` The cylinders are each provided Further, it will be noted from Figure 1, .5 with a plurality of longitudinal fins 6 which that the pairs of pipes 1l open into the casproject radially from the body of the cylining 12 on opposite sides thereof, and thus, a der These radial Hns arel joined at their very uniform flow of air issecured. outer ends byrvnneans of the circumferential A This outboard motor is provided with a' or annular Hn 7 as most clearly shown in flanged portion 17 which rests upon the l`cor- 105 `0 Figure 2. The fins are surrounded by an responding flange of the hull or body porouter shell or casing 8 which contacts with tion 18 of the device. Further, the-'body their outer edges. The radial Hns are conof the motor is provided with `Ja'sleeve 19 tinued over the ends of the cylinders as which lits within a collar 20carried withindicated at 6 in Figure 1, and the shell 8 in the upper end .f the body portion 18. 11.0 Y i is provided with an inlet aperture 9, as This bod `portion 18 houses the vertical shown in such figure, through which the endriving s aft 20 and the reverse ro'd 21 for controlling the angleof the blades of the propeller 22 in the usual manner. Further, it is preferable. to provide a slip joint for the engine shaft i in regard to the shaft 2O so that the motor may be lifted from the body portion 18 of the apparatus when it is desired, such motor being temporarily locked in place by bolts 23. rllhis body portion is hingedly joined to clamps 24 by means of which it may be attached to the boat. A controlling lever 25 is employed in the usual manner to steer and control the setting of the propeller blades.

The body portion 18 is preferably formed of two half sect-ions secured together, as shown, by means of bolts 26. The body portion widens in a forward and rearward di rection towards its lower end and formsa stream line section as shown in Figure 3. This body portion obviously forms, in eiect, the rudder for the apparatus, and may be rocked by means of the lever 25.

It is to he particularly noted that by means of this invention a novel form of air cooled motor is produced in such a way that the motor has its cylinders cooled equally at all portions by the uniformly distributed air stream. Further, it is to be noted, that an easily produced fly wheel construction is provided by this invention so that the ly wheel itself acts as the air propelling device.

Although the invention has been described in considerable detail, such description is intended as illustrative rather than limiting as the invention may be variously embodied`4 and as the scope of such invention is to be determined as claimed.

I claim:

1. In an outboard motor, the combination of a cylinder provided with a plurality of radial fins, an annular iin joining the outer portions of the radial fins, a casing surrounding said cylinder and having an opening adjacent the head of the cylinder for the admittance of air, a air of pi es opening into the casing at iametrical y opposite points, a fly wheel provided with\a1 r propelling means, and a casing associated with means of the pivotally mountedn the ily wheel and communicating with said pipes,' the annular fin forming apertures with the radial ns of gradually decreasing size adjacent the air pipe and of gra-dually increasing size at points remote from the air pipe.

2. In a air cooled motor, the combination of a cylinder having radial fins, and having an annular lin joining the outer portions of the radial fins adjacent the inner end of the cylinder, a shell surrounding the cylinder and contactingwith the fins, said shell having an air entrance aperture adjacent the head of the cylinder, a pair -of pipes opening into said shell adjacent the inner end of the cylinder and at diametrically opposed points, the radial iin being spaced from the body of the cylinder to form apertures of a minimum size adjacent said pipes and to form apertures of a large size at points remote from said pipes.

3. An outboard motor comprising a body portion, a pair of opposed cylinders carried by the upper end of said body portion, a propeller carried by the lower end of the body portion and operatively connected to said motor, the cylinders of said motor Veach having a plurality of radial fins and having an annular 1in joining the outer ends of the radial ins and providing with the radial fins a series of apertures ,of large size at diametrically opposite points and of small size at points intermediate the first mentioned points, said motor having a iy wheel at its upper end, a plurality of vanes `formed on said yf ly Wheel, a casing surrounding the lower portion of said Hy wheel', a casing surrounding each of said cylinders and contacting with said fins, and a plurality of air pipes joining the fly wheel casing with the cylinder casings, such pipes opening into the cylinder v4casings at the above mentioned intermediate points.

In testimony-that I claim 'the foregoing I have hereunto set my hand at Milwaukee, in the Acounty of Milwaukee and State of Wisconsin.

GEORGE W. GRASS. 

